Dec 19 14:17:28.885 INFO checking kirjavascript/duplex against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 14:17:28.885 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/kirjavascript/duplex:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:17:29.419 INFO [stdout] 737450a18a3ffad2dbe2dd36d24620ac1e9ae656049cefa6c9f3abff2eeecd5c
Dec 19 14:17:29.421 INFO running `"docker" "start" "-a" "737450a18a3ffad2dbe2dd36d24620ac1e9ae656049cefa6c9f3abff2eeecd5c"`
Dec 19 14:17:31.807 INFO [stderr]     Checking memchr v2.1.1
Dec 19 14:17:31.807 INFO [stderr]    Compiling syn v0.15.22
Dec 19 14:17:32.834 INFO [stderr]     Checking nom v4.1.1
Dec 19 14:17:43.279 INFO [stderr]    Compiling serde_derive v1.0.80
Dec 19 14:17:53.691 INFO [stderr]    Compiling stdweb-derive v0.5.1
Dec 19 14:17:53.692 INFO [stderr]    Compiling stdweb-internal-macros v0.2.2
Dec 19 14:17:57.752 INFO [stderr]     Checking stdweb v0.4.10
Dec 19 14:18:14.272 INFO [stderr]     Checking duplex v0.1.0 (/opt/crater/workdir)
Dec 19 14:18:14.596 INFO [stderr] error[E0658]: The attribute `js_export` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Dec 19 14:18:14.596 INFO [stderr]  --> src/web.rs:6:3
Dec 19 14:18:14.596 INFO [stderr]   |
Dec 19 14:18:14.596 INFO [stderr] 6 | #[js_export]
Dec 19 14:18:14.596 INFO [stderr]   |   ^^^^^^^^^
Dec 19 14:18:14.596 INFO [stderr]   |
Dec 19 14:18:14.596 INFO [stderr]   = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 19 14:18:14.596 INFO [stderr] 
Dec 19 14:18:14.600 INFO [stderr] error[E0658]: The attribute `js_export` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
Dec 19 14:18:14.600 INFO [stderr]  --> src/web.rs:6:3
Dec 19 14:18:14.602 INFO [stderr]   |
Dec 19 14:18:14.602 INFO [stderr] 6 | #[js_export]
Dec 19 14:18:14.602 INFO [stderr]   |   ^^^^^^^^^
Dec 19 14:18:14.602 INFO [stderr]   |
Dec 19 14:18:14.602 INFO [stderr]   = help: add #![feature(custom_attribute)] to the crate attributes to enable
Dec 19 14:18:14.602 INFO [stderr] 
Dec 19 14:18:14.603 INFO [stderr] error: aborting due to previous error
Dec 19 14:18:14.603 INFO [stderr] 
Dec 19 14:18:14.603 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 19 14:18:14.607 INFO [stderr] error: aborting due to previous error
Dec 19 14:18:14.607 INFO [stderr] 
Dec 19 14:18:14.608 INFO [stderr] For more information about this error, try `rustc --explain E0658`.
Dec 19 14:18:14.612 INFO [stderr] error: Could not compile `duplex`.
Dec 19 14:18:14.612 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 19 14:18:14.617 INFO [stderr] error: Could not compile `duplex`.
Dec 19 14:18:14.617 INFO [stderr] 
Dec 19 14:18:14.617 INFO [stderr] To learn more, run the command again with --verbose.
Dec 19 14:18:15.025 INFO running `"docker" "inspect" "737450a18a3ffad2dbe2dd36d24620ac1e9ae656049cefa6c9f3abff2eeecd5c"`
Dec 19 14:18:15.156 INFO running `"docker" "rm" "-f" "737450a18a3ffad2dbe2dd36d24620ac1e9ae656049cefa6c9f3abff2eeecd5c"`
Dec 19 14:18:15.287 INFO [stdout] 737450a18a3ffad2dbe2dd36d24620ac1e9ae656049cefa6c9f3abff2eeecd5c